I dont have a ton yet, I have a regular 29gal and a fluval spec 5.6 gal. Which I imagine would be like a mr aqua 6gal long (similar dimensions and all). When I get a new tank the fluval will come with me to work to keep the tank count at home to 2.
My other concern is I have a little one so the wife is a little worried about them putting their hands into the tank if it is shallow
(which is a shame as I love the look of F series shallow tanks).
zodduska's journal is very nice and I also was talking to them on this subject.
Maybe a 60P then instead of a 60F? Gives the same footprint just a double the height.
I should really just change the title to this thread "Which tank to buy next" As it keeps on changing.
Not knowing your setup, well I know what tanks you have but haven't seen them, I am kind of guessing your 29 is your main tank.
I really struggled over and over trying to do something cool with a 29, I feel I did one as well as I could ever do it, I have only seen a few I really like. I know you haven't been at it long but if you haven't invested significant money into anything specific to the 29 (stand/lighting), I would consider moving away from it. I really wish someone made a rimless 20L as I love the size, probably better than my 60P in dimensions, but I cannot find anything outside of custom made.
On the flip side, my wife likes the 60P much better. It has enough "presence" in the room without being over the top. My house is small though.
I think tanks like the 60F are good if you either don't have room for bigger, or you have other tanks. I have considered a 60F for my 3rd tank (I am trying to limit my tanks now, I used to have up to 6 and it gets to be too much work) instead for a cube.
Between all the tanks you have thrown out...I am thinking 90P haha. I know that is probably doesn't seem like a straight line thought process but it is relatively wide, not that tall for the size, and deeper than other ADA offerings. You could start with a 40B or 50 and upgrade the tank later to save some money.
That said, if you ever want to come by and see my 60P, let me know. At our next meet, if you can make it, you can see a 12 long in person if you haven't seen either setup.
My thoughts are ditch the 29 and get something around the same size, 60P or bigger. Get your kids into that tank and replace the spec with a 12 long or cube (with approval from them). Or keep the spec, let them control that and have 3 tanks. I don't know how old your kids are but I know my friends daughter (4 years) has a good idea of what she would change about my tanks, haha.